Stereoscopic apparatus.



Hf c.A sNo0K-& Efw. KELLY.

STEREOVSGOPIG APPARATUS. APPLICATION FILED Amm, 1910.

Patented'July 11, 191'1.`

WITNESSES A TToRNEY H. C. SNOOK 6u E. W. KELLY.

STEREOSGOPIG APPARATUS.

APPLICATION FILED 1116.2, 1910.

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l 'w/TNEssEs l v I angst-g 7 9 13g A TroRNEY Patented .111157 1'1, 1911.`

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HOMER CLYDE SNOOK AND EDWIN W. KLLY,' OF PI'IILADELPHIA, PENNSYLVANIA.

STEREOSCOPIC APPARATUS.

Specification of Letters Patent.

Application filed August 2, 1910. Serial No. 575,066.

To all 'whom it may concern: p

Be it known that we, HOMER CLYDE SNooK and EDWIN KELLY, citizens of the United States, residing at Philadelphia, 'in the county of Philadelphia and State yof Pennsylvania, have invented new and useful Improvements in Stereoscopic Apparatus, of which the following is al specifica tion.

Our invention relates to apparatus whereby stereoscopic photographic or radiographic plates or prints or transparencies may be viewed and examined.

Our invention resides in stereoscopic apparatus, such as above referred to, and particularly to stereoscopic apparatus for use in the examination of plates or negatives taken by X-rays or other radiations; and the features of our invention are hereinafter described and claimed.

` For an illustration of one of the forms our invention may take, referenceA is to be had to the accompanying drawings, in

. which View, partly in section,

Figure 1 is a side elevational view yof the stereoscopic apparatus. Fig. 2 is a top plan of the mirror apparatus. Fig. 3 is a horizontal sectional view through one of the view boxes, some parts being shown in plan. Fig. 4 is a front elevational view lof a view box. Fig, 5 is' a fragmentary vertical sectional view of a view box, some parts in elevation. l

Referring toFig. 1, B and B represent two view boxes supportednupon the longitudinally extending table 1 provided with supports orlegs 2. Upon the top of the table 1 is provided the board or member 3,

`longitudinally grooved `on each side at 4.

The member 3 isembraced by 5, 5, Fig. 4, while` the tongues in the front and rear grooves 4,

the grooves 6, 6 engage whereby the blocks 7 Vmay be adjusted longitudinally of the table 1.

Pivoted upon each block 7 upon a vertical axis is a block o r member 8 -to which-is'secured the strip or member 9 extending transversely to the table 1, as

viewed in Fig. 1. And secured to the mem#I ber 8 are the vertical members l0 upon which is supported the'y three sided box member 11, open at top'and bottom, and preferably made of sheet 4metal enameled or other suitabley sources of electrical or other connectionsk being made 4to these light sources.

or paintedy white upon the interior surfaces v or reecting light .toward the plate or negative. Extending across the top and bottom of each box 11 is a strip 12 of wood or other suitable insulating material upon which are supported incandescent lamps 13 light, suit-able v The members 9 arc grooved longitudinally as indicated ati14, the sides of the groove being inclined to the vertical, so that the negative or photographic plate 15, having thereon an .image to be viewed, will be slightly inclined from the vertical to rest safely against the apparatus.y

. Intervening between the negative o1' plate 15 and thev lightsources 13 is disposed a ground or frosted glass, or other translucent material 16, supported `in the members 9 and 10. And intervening between the Patenten `Jouy- 11, 1911.

ground glass 16 an'd the light sources 13 is disposed a sheet of translucent material, such as tracing linen 17, supported at some distance from the frame formed Vb v the parts 9 and 10, upon studs or buttons 18 held thereto by strips 19 secured by screws 20. It will be noted that gaps 21 exist-be tween the translucent member 17 and the supporting frame therefor, .both at the bottom and at the top, whereby the air heated by the light sources can readily pass up between the translucent members 16 and 17 and out at the gaps at the top whereby the temperature is maintained low and far below a temperature injurious to either membersl'and 17 or any otherl parts.

Across the top of the frame 10, 10 extends a curtain roller 22 pivoted at 23 in the brackets 24, anda vertical rod 25 is disposed on oney side of the view box. A vertically movable curtain 26 is rolled upon the roller 22, which has within it a spring, not shown',l for lrolling the curtain up upon the roller. At one side of the vertically movable curtain is provided a split tube 27 em bracing the rod 25 vand. engagingthe same frictionally, the friction being sufficient to hold'the curtain in any of its vertical'positions, no pawl or locking device being provided for the spring roller 22. Extending horizontally across the top of the view box and supported in the brackets 24 is the horizontal rod 28 with which' frictionally engages a split tube 29, similar to 27, upon the cnd of the which is rolled up on roller 31 pivoted in brackets 32, the roller 31 being similar to roller 22, as 'to its spring, control.. The friction of the tube 29 upon rod 28 1s suicient to hold the curtain 30 in any of its adjusted positions in opposition to the roller spring. The horizontally movable curtain 30 has its lower edge movable transversely in the slot 14. By adjusting the curtains 26 and 30 to any desired positions, they may be brought to the edges of a negative or plate of any desired size, thus shutting ofi the light from the sources 13 through everything except the. plate or negative.

Attlie middle of the member 3 are niount,

ed the members 33 on which slides transversely to the table 1, the member 34 carrying the vertical pins 35 supporting the member 36 supporting in turn the vertically extending member 37"L upon which is supported a member 36a similar to the member 36. Upon the members 36, 36 are mounted the mirrors 37, 37 disposed substantially at right angles to each other and at 45 degrees to the longitudinal axis of the table 1. Normally to the mirror surfaces extend the horizontal rods 38 at the bottom of the mirrors, and approximate the tops of the mirrors are similar rods 39 carried by post 40. Upon each pair of rods 38, 39 is a curtain 41, each adjustable longitudinally of its supportin rods toward or away from the mirrors 37 or 37.

The view boxes B and B are pivoted, as aforesaid,`so that the boxes maybe rotated to have the negatives face the front of the table, so that they may be examined independently of each other.

'The operation of the apparatus is as ollows.: An exposure is made upon one plate with the X-ray tube in a given position; the object radiographed is then placed in the same position with respect to a second plate, which is then exposed after the X-ray tube has been'moved a distance of substantially 23- inches, the average distance between the human eyes. Whentliese plates are developed they are slid into the slots 14 of the respective view boxes B and B', and the curtains 26 and 30 adjusted to their edges. The current is turned on to the electric lights 13, or the other light sources are lighted or energized, whereupon difused light is thrown through the images on the .two plates or negatives which are symmet rically` disposed on both sides of the mirrors 37,37" which are adjusted transversely to the table until the two images appear superimposed. The view boxes B and B are adjusted along the table 1 by aid of the horizontally movable curtain 30,.

scales 42, 42 engraved or marked thereon to such points on the scale that will bring tlie negatives the same distance from the observers eyes (measured from the eyes to the mirrors 37, 37 and thence to the negatives or plates) as the distance between the target of the X-ray tube and the plates during the exposures. The observer may move the curtains 41 toward or away from their respective mirrors to shut of any undesired light from sources other than the sources 13.

What we claim is:

1. The combination with a table, of view boxes movable lon itudinally thereof, means for associating a p ate or negative with each vview box, mirrors disposed between said view boxes, and scales between said mirrors and said view boxes for determining4 the optical distance from said plates or negatives to the eyes of the observer via said mirrors.

2. In apparatus of the class described, a table, sup orts for image plates or negatives on said ta le, observing mirrors disposed at an angle with respect to each other and between said plate or negative supports, a support for said mirrors movable transversely of said table, and scales between said mirrors and said plate supports for determining the optical distance via said mirrors from the image plates or negatives to the eyes 'of the observer.

3. In apparatus of the class described, a table, View boxes comprising supports for image plates or negatives and sources of light, means for pivoting said view boxes upon said table, supports for said view boxes movable longitudinally of said table, mirrors disposed at an angle with respect to.

each other and located between said view boxes, a support for said mirrors movable transversely of said table, and scales between said mirrors and said view boxes for determining the optical distance via said mirrors from the image plates or negativesy to the eyes of the observer.

4. 1n stereoscopic apparatus of the character described, a plurality of separated view boxes, a plurality of mirrors disposed at an angle with respect to each other between said view boxes, means for supporting curtains in planes at right angles to the planes of said mirrors, and curtains movable upon said supports.

5. A view box of the character described comprising a supporting frame adapted to support a plate or negative, an associated .source of light, a translucent member supported within said frame, a second translucent member supported on and at a distance from the edge of said frame, the space between said translucent members communieating freely with the air at the bottom and at the top of said space, said separated eaajass translucent members lntervenlng between said hght source and saldplate or negatlve.-

lucent fabric supported by and at a distance from the edge of said frame, said translucent members mtervenmg 'between said source of light and said plate or negative.

V7. In a View box, of the character described, the combination with a frame, of means associated therewith `for supporting a plate or negative, a spring-wound curtain supported upon one side lof said frame, and frictionally engagingmembers for holding said curtain in adjusted position with respect to-said plate or negative.

8. In a view box of the character described, the combination with a frame, of

means associated therewith for supporting a plate or negative, and a pair of curtains supported respectively on different sides of said frame and adjustable in directions at right angles to each other with respect to said plate or negative.

9. In a View box of the character described, the combination with aframe, of means associated therewith for supporting a plate or negative, a pairv of spring-controlled curtains mounted on different sides of said frame and adjustable in directions at rightangles to each otherwith respect .to said plate or negative, said curtains movable in parallel but different planes, and frictionally engaging members for holding said curtains in adjusted positions.

10. In a view box, the combination'with a casing, of a light source'therein, a negative or plate supporter, a frosted or ground glass intervening between the plate or negative and said light source, and a translucent cloth intervening between said plate ornegative and said light source.

11. In a view box, the combination with a casing, of a light source therein, a negative' or plate supporter, a frosted or ground glass intervening between the plate or negative and said light source, and a translucent cloth intervening between said plate or negative and said light source, said cloth and glass being separated by ventilation gaps.

12. In a viewA box, the combination with a plate or negative supporting frame, of a light source, a member inclosing said light source, except on the side toward the plate or negative, the inner surfaces of said inclosing member serving to reect light, and a translucent Vmember carried by said frame and intervening between said light source and the plate or negative.

1 3. In a view box, the combinatlon with a plate or negative supporting frame, of -a light source, a member inclosing said light source except on the side toward the plate or negative, the interior surfaces of said inclosing member serving to reliect light, a

plurality vof translucent members supported between said light sources and said plate or negative.

15. In a View box, the combination with a supporting frame, of means associated therewith adapted to support a plate or negative, a source of light, a three-sided member inclosing said light source and secured at its two edges to said frame, a translucent member intervening between said light source and ,the plate or negative and supported by said frame, and a curtain supported on said frame on the side of said translucent member away from said -light source, said curtain adapted to be adjusted with respect to the plate or negative.

16. In a view box, the combination with a plate or negative supporter, of a plurality vof light sources, a member inclosing said light sources on all sides except toward the plate or negative, the interior surfaces of` ing said view boxes longitudinally of said support, and a source of light movable with each view box and disposed on the side of the plate or negative opposite to the associated mirror.

18. In apparatus of the class described, the combination with a table, of mirrors disposed at an angle with respect to each gother upon said table, View boxes disposed upon said table upon opposite sides of said -mirrors, each view box comprising a plate or negative supporter, curtains movable 1910, in the presence ofthe two subscribing with respect to the plate or negatfive znd at witnesses. Y right angles to each other, one 0 sai curtains beingl movable transversely of said vgLgLvNOOK table, and means for adjusting said mirrors l transversely of Said table. y Witnesses:

In testimony whereof we have hereunto ELEANon T. MCCALL, affixed our signatures this 30th day of J uly, ANNA E. STEINBOCK. 

